The process in production of stainless steel pickling passivation treatment basi
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The 1 cutting processing after the cleaning and pickling passivation
Stainless steel workpiece cutting machining on the back surface usually residual iron, steel and cooling emulsion and other dirt, will make the stainless steel surface appears stain and rust, and should therefore be carried out degreasing and cleaning, cleaning is removed by nitric acid, iron steel end, and carried out the passivation.
2 before and after welding cleaning and pickling passivation
Because oil is the source of hydrogen in the weld formation pressure, will not remove grease, and low melting point metal pollution (such as zinc rich paint) welding will cause cracking, so the stainless steel welding must be surface groove and both sides of the 20mm within the clean, oil available acetone scrub rust, paint should be used with a cloth or stainless steel wire brush to remove, acetone wipe.
Manufacture of stainless steel equipment regardless of the welding technology, welding after cleaning of all welding slag, spatter, stain and oxidation colors were trying to get rid of, clear method including mechanical cleaning and chemical cleaning. A grinding and polishing and sand blasting shot peening cleaning machinery, should avoid to use carbon brush, to prevent surface rust. In order to obtain the best corrosion resistance, can be soaked in the mixed solution of HNO3 and HF, or by pickling passivation cream. In fact, often 4 CF 1 mechanical cleaning and chemical cleaning combined application.
Cleaning 3 forging casting
The stainless steel workpiece malleable heat after processing, there is often a layer of oxide skin, lubricant or oxide surface contamination, including graphite, MoS2 and pollutants such as carbon dioxide. Through shot peening treatment, salt bath treatment and multichannel pickling. Such as stainless steel turbine blades for American processing technology:
Salt bath (10min), water quenching (2.5min), sulfate (2min), cold water wash wash (2min), alkaline permanganate bath (10min), wash with cold water (2min), sulfate (1rain), cold water wash wash wash (1min), nitrate (1.5min), cold water washing, hot water washing ((1min) 1min), air drying.